Efeitos do pré-tratamento dentinário e temperatura do adesivo na resistência adesiva de um sistema adesivo universal
Ano de defesa: | 2016 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
BR Odontologia UFSM Programa de Pós-Graduação em Ciências Odontológicas |
Programa de Pós-Graduação: |
Não Informado pela instituição
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Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
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Palavras-chave em Português: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/6190 |
Resumo: | This study aimed to evaluate the effects of dentin pretreatment and temperature on the bond strength of a universal adhesive system to dentin. Ninety-six extracted non-carious human third molars were randomly divided into 12 groups (n=8) according to Scotchbond Universal Adhesive (SbU) applied in self-etch (SE) and total-etch (TE) mode, adhesive temperature (20ºC or 37ºC) and sodium bicarbonate or aluminum oxide air abrasion. After composite build up, bonded sticks with cross-sectional area of 1 mm² were obtained to evaluate the microtensile bond strength (μTBS). The specimens were tested at a crosshead speed of 0.5 mm/min on a universal testing machine until failure. Fractured specimens were analyzed under stereomicroscope to determine the failure patterns in adhesive, cohesive (dentin or resin) and mixed fractures. The microtensile bond strength data was analyzed using to two-way ANOVA and Tukey s test (p<0.01). Interaction between treatment and temperature was statistically significant to SbU applied in SE technique. Both dentin treatments showed higher bond strength to TE mode, regardless of adhesive temperature. When compared to control group, sodium bicarbonate increased bond strength of SbU in SE mode. Adhesive temperature did not significantly affect the μTBS of tested groups. Predominantly, adhesive failure was observed for all groups. Thus, the dentin pretreatment may be an alternative to improve the adhesive properties of the Scotchbond Universal adhesive system. |